9 CHOICE OF TOOL Resulting Geometry (Milling Cutter + Indexable Insert) GAMO GAMO GAMO - g0 - g0 + g0 The following table lists the three basic milling cutter geometries and the approximate priority of their use with regard to the type of machined material. More detailed information about individual tool families with consideration of insert geometries can be found in the catalogue sec- tion. Selection of cutter geometry according to application Conditions Negative – Negative Negative – Positive Positive – Positive GAMP (A.R.) - + + Structural parameter ofthe bodyGAMF (R.R.) - - + GAMO - + + Carbon steels, alloy steels (< 300 HB) Stainless steels (< 300 HB) Stainless steels (> 300 HB) Cast iron, ductile iron Machined material Al alloys Copper and its alloys Titanium and its alloys Hardened steels (40 – 55 HRC) Number of Teeth on the Milling Cutter The number of teeth on the milling cutter is also important in relation to the width of the milled surface, where it determines the force (and acoustic) characteristics of the cut, as indicated in the following figure. Feed per minute + ++ +++ Tough materials +++ ++ + Power requirement + ++ +++ Resulting roughness +++ ++ + 705